Mason jar lid



FIG. 1 is a bottom perspective view of a mason jar lid showing our new design in a closed position;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a bottom perspective view thereof showing our new design in an open position.

The dashed broken lines and areas within them adjacent to the shaded areas depict portions of the mason jar lid that form no part of the claimed design. 

CLAIM The ornamental design for a mason jar lid, as shown and described. 